Editing Crawling and indexing (section)

===Crawling===
Crawling is the process by which search engines like Google, Bing, and Yahoo discover updated content on the web, such as new sites or pages, changes to existing sites, and dead links. To perform this task, they use bots called '''crawlers''' or '''spiders'''. These bots follow links from page to page, gather information, and send it back to the search engine's servers.